Bride of Frankenstein (advertised as The Bride of Frankenstein) is a 1935 American horror film, the first sequel to Frankenstein (1931). Bride of Frankenstein was directed by James Whale and stars Boris Karloff as The Monster, and features Elsa Lanchester in the dual role of his mate and Mary Shelley, Colin Clive as Henry Frankenstein, and Ernest Thesiger as Doctor Septimus Pretorius.

The film follows on immediately from the events of the earlier film, and is rooted in a subplot of the original Mary Shelley novel, Frankenstein (1818). In the film, a chastened Henry Frankenstein abandons his plans to create life, only to be tempted and finally coerced by the Monster, encouraged by Henry's old mentor Dr. Pretorius, into constructing a mate for him.

Preparation began shortly after the first film premiered, but script problems delayed the project. Principal photography started in January 1935, with creative personnel from the original returning in front of and behind the camera. Bride of Frankenstein was released to critical and popular acclaim, although it encountered difficulties with some state and national censorship boards. Since its release the film's reputation has grown, and it is hailed as Whale's masterpiece. Modern film scholars, noting Whale's homosexuality and that of others involved in the production, have found a gay sensibility in the film, although a number of Whale's associates have dismissed the idea.

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On a stormy night, Percy Bysshe Shelley (Douglas Walton) and Lord Byron (Gavin Gordon) praise Mary Shelley (Elsa Lanchester) for her story of Frankenstein and his Monster. Reminding them that her intention was to impart a moral lesson, Mary says she has more of the story to tell. The scene shifts to the end of the 1931 Frankenstein.

Villagers gathered around the burning windmill cheer the apparent death of the Monster (Boris Karloff, credited as "Karloff"). Their joy is tempered by the realization that Henry Frankenstein (Colin Clive) is also apparently dead. Hans (Reginald Barlow), father of the girl the creature drowned in the previous film, wants to see the Monster's bones. He falls into a flooded pit underneath the mill, where the Monster – having survived the fire – strangles him. Hauling himself from the pit, the Monster casts Hans' wife (Mary Gordon) into it to her death. He next encounters Minnie (Una O'Connor), who flees in terror.

Henry's body is returned to his fiancée Elizabeth (Valerie Hobson) at his ancestral castle home. Minnie arrives to sound the alarm about The Monster, but her warning goes unheeded. Elizabeth, seeing Henry move, realizes he is still alive. Nursed back to health by Elizabeth, Henry has renounced his creation, but still believes he may be destined to unlock the secret of life and immortality. A hysterical Elizabeth cries that she sees death coming, foreshadowing the arrival of Henry's former mentor, Doctor Septimus Pretorius (Ernest Thesiger). In his rooms, Pretorius shows Henry several homunculi he has created, including a miniature queen, king, archbishop, devil, ballerina, and mermaid. Pretorius wishes to work with Henry to create a mate for the Monster and offers a toast to their venture: "To a new world of gods and monsters!" Upon forcing Henry to help him, Pretorius will grow an artificial brain while Henry gathers the parts for the mate.

The Monster saves a young shepherdess (Anne Darling) from drowning. Her screams upon seeing him alert two hunters, who shoot and injure the creature. The hunters raise a mob that sets out in pursuit. Captured and trussed to a pole, the Monster is hauled to a dungeon and chained. Left alone, he breaks his chains and escapes.

That night the Monster encounters a gypsy family and burns his hand in their campfire. Following the sound of a violin playing "Ave Maria", the Monster encounters an old blind hermit (O. P. Heggie) who thanks God for sending him a friend. He teaches the monster words like "friend" and "good" and shares a meal with him. Two lost hunters stumble upon the cottage and recognize the Monster. He attacks them and accidentally burns down the cottage as the hunters lead the hermit away.

Taking refuge from another angry mob in a crypt, the Monster spies Pretorius and his cronies Karl (Dwight Frye) and Ludwig (Ted Billings) breaking open a grave. The henchmen depart as Pretorius stays to enjoy a light supper. The Monster approaches Pretorius, and learns that Pretorius plans to create a mate for him.

Henry and Elizabeth, now married, are visited by Pretorius. He is ready for Henry to do his part in their "grand collaboration". Henry refuses and Pretorius calls in the Monster who demands Henry's help. Henry again refuses and Pretorius orders the Monster out, secretly signaling him to kidnap Elizabeth. Pretorius guarantees her safe return upon Henry's participation. Henry returns to his tower laboratory where in spite of himself he grows excited over his work. After being assured of Elizabeth's safety, Henry completes the Bride's body.

A storm rages as final preparations are made to bring the Bride to life. Her bandage-wrapped body is raised through the roof. Lightning strikes a kite, sending electricity through the Bride. Henry and Pretorius lower her and realize their success. "She's alive! Alive!" Henry cries. They remove her bandages and help her to stand. "The bride of Frankenstein!" Doctor Pretorius declares.

The excited Monster sees his mate (Elsa Lanchester) and reaches out to her, asking, "Friend?" The Bride, screaming rejects him. "She hate me! Like others" the Monster dejectedly says. As Elizabeth races to Henry's side, the Monster rampages through the laboratory. The Monster tells Henry and Elizabeth "Yes! Go! You live!" To Pretorius and the Bride, he says "You stay. We belong dead." While Henry and Elizabeth flee, the Monster sheds a tear and pulls a lever to trigger the destruction of the laboratory and tower.

Universal considered making a sequel to Frankenstein as early as its 1931 preview screenings, following which the film's original ending was changed to allow for Henry Frankenstein's survival. James Whale initially refused to direct Bride, believing he had "squeezed the idea dry on the first film. Following the success of Whale's The Invisible Man, producer Carl Laemmle, Jr. realized that Whale was the only possible director for Bride; Whale took advantage of the situation in persuading the studio to let him make One More River. Whale believed the sequel would not top the original, so he decided instead to make it a memorable "hoot". According to a studio publicist, Whale and Universal's studio psychiatrist decided "the Monster would have the mental age of a ten-year old boy and the emotional age of a lad of fifteen".

Screenwriter Robert Florey wrote a treatment entitled The New Adventures of Frankenstein — The Monster Lives!, but it was rejected without comment early in 1932. Universal staff writer Tom Reed wrote a treatment under the title The Return of Frankenstein, a title retained until filming began. Following its acceptance in 1933, Reed wrote a full script that was submitted to the Hays office for review. The script passed its review, but Whale, who by then had been contracted to direct, complained that "it stinks to heaven". L. G. Blochman and Philip MacDonald were the next writers assigned, but Whale also found their work unsatisfactory. In 1934, Whale set John L. Balderston to work on yet another version, and it was he who returned to an incident from the novel in which the creature demands a mate. In the novel Frankenstein creates a mate, but destroys it without bringing it to life. Balderston also created the Mary Shelley prologue. After several months Whale was still not satisfied with Balderston's work and handed the project to playwright William J. Hurlbut and Edmund Pearson. The final script, combining elements of a number of these versions, was submitted for Hays office review in November 1934. Kim Newman reports that Whale planned to make Elizabeth the heart donor for the bride, but film historian Scott MacQueen states that Whale never had such an intention.

Sources report that Bela Lugosi and Claude Rains were considered, with varying degrees of seriousness, for the role of Frankenstein's mentor, Pretorius; others report that the role was created specifically for Ernest Thesiger. Because of Mae Clarke's ill health, Valerie Hobson replaced her as Henry Frankenstein's love interest, Elizabeth. Early in production, Whale decided that the same actress cast to play the Bride should also play Mary Shelley in the film's prologue, to represent how the story — and horror in general — springs from the dark side of the imagination. He considered Brigitte Helm and Phyllis Brooks before deciding on Elsa Lanchester. Lanchester, who had accompanied husband Charles Laughton to Hollywood, had met with only moderate success while Laughton had found success with several films (including Whale's own The Old Dark House) and had won an Academy Award for his role in The Private Life of Henry VIII. Lanchester had returned alone to London when Whale contacted her to offer her the dual role. Lanchester modeled the Bride's hissing on the hissing of swans. She gave herself a sore throat while filming the hissing sequence, which Whale shot from multiple angles.

Colin Clive and Boris Karloff reprised their roles from Frankenstein as creator and creation, respectively. Hobson recalled Clive's alcoholism had worsened since filming the original, but Whale did not recast the role because his "hysterical quality" was necessary for the film. Karloff strongly objected to the decision to allow the Monster to speak. "Speech! Stupid! My argument was that if the monster had any impact or charm, it was because he was inarticulate – this great, lumbering, inarticulate creature. The moment he spoke you might as well ... play it straight." This decision also meant that Karloff could remove his dental plate, so now his cheeks did not have the sunken look of the original film. Whale and the studio psychiatrist selected 44 simple words for the Monster's vocabulary by looking at test papers of ten-year olds working at the studio. Dwight Frye returned to play the doctor's assistant, Karl, having played the hunchback Fritz in the original. Frye also filmed a scene as an unnamed villager and the role of "Nephew Glutz", a man who murdered his uncle and blamed the death on the Monster. Boris Karloff is credited simply as KARLOFF, which was Universal's custom during the height of his career. Elsa Lanchester is credited for Mary Shelley, but in a nod to the earlier film, the Monster's bride is credited only as "?" just as Boris Karloff had been in the opening credits of Frankenstein.

Universal makeup artist Jack Pierce paid special attention to the Monster's appearance in this film. He altered his 1931 design to display the after-effects of the mill fire, adding scars and shortening the Monster's hair. Over the course of filming, Pierce modified the Monster's makeup to indicate that the Monster's injuries were healing as the film progressed. Pierce co-created the Bride's makeup with strong input from Whale, especially regarding the Bride's iconic hair style, based on Nefertiti. Lanchester's hair was given a Marcel wave over a wire frame to achieve the style. Lanchester disliked working with Pierce, who she said "really did feel that he made these people, like he was a god ... in the morning he'd be dressed in white as if he were in hospital to perform an operation." To play Mary Shelley, Lanchester wore a white net dress embroidered with sequins of butterflies, stars, and moons, which the actress had heard required 17 women 12 weeks to make.

Kenneth Strickfaden created and maintained the laboratory equipment. Strickfaden recycled a number of the fancifully-named machines he had created for the original Frankenstein for use in Bride, including the "Cosmic Ray Diffuser", and the "Nebularium". A lightning bolt generated by Strickfaden's equipment has become a stock scene, appearing in any number of films and television shows. The man behind the film's special photographic effects was John P. Fulton, head of the special effects department at Universal Studios at the time. Fulton and David S. Horsely created the homunculi over the course of two days by shooting the actors in full-size jars against black velvet and aligning them with the perspective of the on-set jars. The foreground film plate was rotoscoped and matted onto the rear plate. Diminutive actor Billy Barty is briefly visible from the back in the finished film as a homunculus infant in a high chair, but Whale cut the infant's reveal before the film's release.

Whale met Franz Waxman at a party and asked him to score the picture. "Nothing will be resolved in this picture except the end destruction scene. Would you write an unresolved score for it?" asked Whale. Waxman created three distinctive themes: one for the Monster; one for the Bride; and one for Pretorius. The score closes, at Whale's suggestion, with a powerful dissonant chord, intended to convey the idea that the on-screen explosion was so powerful that the theater where the film was being screened was affected by it. Constantin Bakaleinikoff conducted 22 musicians to record the score in a single nine-hour session.

Shooting began on January 2, 1935 with a projected budget of US$293,750;– almost exactly the budget of the original;– and an estimated 36-day shooting schedule. On the first day, Karloff waded in the water below the destroyed windmill wearing a rubber suit under his costume. Air got into the suit and expanded it like an "obscene water lilly". Later that day, Karloff broke his hip, necessitating a stunt double. Clive had also broken his leg. Shooting was completed on March 7, 1935. The film was ten days over schedule because Whale shut down the picture for ten days until Heggie became available to play the Hermit. With a final cost of $397,023, Bride was more than $100,000 over budget. As originally filmed, Henry and Elizabeth died fleeing the exploding castle. Whale re-shot the ending to allow for their survival, although Clive and Hobson are still visible on-screen in the collapsing laboratory. Whale completed his final cut, shortening the running time from about 90 to 75 minutes and re-shooting and re-editing the ending, only days before the film's scheduled premiere date.